TOUCH DISPLAY PANEL AND LIQUID CRYSTAL DISPLAY

• US 20100164884A1
• Filed: 08/23/2009
• Published: 07/01/2010
• Est. Priority Date: 12/25/2008
• Status: Active Grant

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Chen, Yung-Cheng, Chiu, Po-Chia, Hsu, Shih-Yu
• Granted Patent: US 8,487,900 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

An LCD and a touch display panel that can be integrated in the LCD are provided. The touch display panel comprises an active device matrix substrate that includes multiple sensing lines disposed on multiple data lines correspondingly and arranged parallel thereto, and multiple sensing devices formed on multiple scan lines. When an external pressure is exerted, a current is generated in the sensing lines, and the X and Y coordinates of the touch point is determined from a slight leakage current generated in the scan lines. The conventional external touch screen LCD device is substantially improved in response accuracy of the touch coordinates, material costs, and mechanical thickness.

Claims

1. A touch display panel, comprising:

an active device matrix substrate comprising;

a plurality of data lines;

a plurality of scan lines arranged crossing the data lines perpendicularly;

a plurality of active devices disposed on a plurality of intersections of the data lines and the scan lines;

a plurality of pixel electrodes electrically connected to the active devices;

a plurality of sensing lines disposed on the data lines and arranged parallel thereto;

a plurality of sensing devices disposed on the scan lines;

an opposite substrate disposed opposing the active device matrix substrate, comprising;

a black matrix;

a plurality of first pillars disposed on the black matrix and arranged opposing the sensing lines;

a plurality of second pillars disposed on the black matrix and arranged opposing the sensing devices;

an opposite electrode disposed opposing the active device matrix substrate, and the opposite electrode covers the first pillars and the second pillars; and

a liquid crystal layer, disposed between the active device matrix substrate and the opposite substrate;

wherein according to an external pressure, at least one of the first pillars is electrically connected to least one of the sensing lines and at least one of the second pillars is electrically connected to least one of the sensing devices.

2. The touch display panel as claimed in claim 1, wherein the sensing devices are thin film transistors (TFTs), and each of the TFTs has a gate, a source, and a drain.

3. The touch display panel as claimed in claim 2, wherein the gate of the sensing device and the scan lines are formed in a same layer process.

4. The touch display panel as claimed in claim 2, wherein the source and the drain of each of the sensing device are formed with the data lines in a same layer process.

5. The touch display panel as claimed in claim 2, wherein the gate and the source of each of the sensing device are electrically connected via a transparent conductive layer, and the drain of each of the sensing device is electrically connected to one of a plurality of sensing electrodes correspondingly.

6. The touch display panel as claimed in claim 5, wherein the locations of the sensing electrodes are corresponding to the locations of the second pillars.

7. The touch display panel as claimed in claim 5, wherein the sensing lines, the transparent conductive layer, the sensing electrodes, and the pixel electrodes are formed in a same layer process.

8. The touch display panel as claimed in claim 1, wherein the active devices are TFTs.

9. The touch display panel as claimed in claim 1, wherein a height of each of the first pillars and the second pillars is less than a panel spacing of 1 pm.

10. A liquid crystal display (LCD), comprising:

a touch display panel, comprising;

an active device matrix substrate comprising;

a plurality of data lines;

a plurality of scan lines arranged crossing the data lines perpendicularly;

a plurality of active devices disposed on a plurality of intersections of the data lines and the scan lines;

a plurality of pixel electrodes electrically connected to the active devices;

a plurality of sensing lines disposed on the data lines and arranged parallel thereto;

a plurality of sensing devices disposed on the scan lines;

an opposite substrate disposed opposing the active device matrix substrate, the opposite substrate comprising;

a black matrix;

a plurality of first pillars disposed on the black matrix and arranged opposing the sensing lines;

a plurality of second pillars disposed on the black matrix and arranged opposing the sensing devices;

an opposite electrode disposed opposing the active device matrix substrate, and the opposite electrode covers the first pillars and the second pillars;

a liquid crystal layer disposed between the active device matrix substrate and the opposite substrate; and

a backlight module disposed at a side of the active device matrix substrate away form the opposite substrate;

wherein according to an external pressure exerted, at least one of the first pillars is electrically connected to least one of the sensing lines and at least one of the second pillars is electrically connected to least one of the sensing devices.

11. The LCD as claimed in claim 10, wherein the sensing devices are TFTs, and each TFT has a gate, a source, and a drain.

12. The LCD as claimed in claim 11, wherein the gate of each of the sensing devices and the scan lines are formed in a same layer process.

13. The LCD as claimed in claim 11, wherein the source, the drain of each of the sensing devices and the data lines are formed in a same layer process.

14. The LCD as claimed in claim 11, wherein the gate and the source of each of the sensing devices are electrically connected via a transparent conductive layer, and the drain of each of the sensing device is electrically connected to one of a plurality of sensing electrodes correspondingly.

15. The LCD as claimed in claim 14, wherein the locations of the sensing electrodes are corresponding to the locations of the second pillars.

16. The LCD as claimed in claim 14, wherein the sensing lines, the transparent conductive layer, the sensing electrodes, and the pixel electrodes are formed in a same layer process.

17. The LCD as claimed in claim 10, wherein the active devices are TFTs.

18. The LCD as claimed in claim 10, wherein a height of each of the first pillars and the second pillars is less than a panel spacing of 1 pm.

19. The LCD as claimed in claim 10, wherein the backlight module is a side-edge backlight module or a direct-type backlight module.